Compaq Presario C785TU laptop is an Intel based laptop with a Core 2 Duo processor, 1 GB RAM, 160 GB Hard Disk, DVD Burner, 15.4" display, Wireless and so on. The factory installed operating System is FreeDOS. You will have to install an operating system inorder to work in this machine. This machine is designed for Windows Vista. Drivers for Vista are given in the company's website. Installing Windows XP is not recommended as there is no guarantee that the drivers would work well with XP. Anyways, here we have given the set of drivers for this laptop for Windows XP

Please go through the following to know more about Issues regarding downgrading to XP in HP-Compaq desktops and laptops

Your Presario is shipped with the High definition Audio controller, so you have to first install the Microsoft UAA driver and then install the Audio driver.

Here is the link for Microsoft UAA driver link:
http://asia.giga-byte.com/FileList/Driver/motherboard_driver_audio_realt...

Installation Instructions :
1. Download the SoftPaq .EXE file to a directory on your hard drive.
2. Execute the downloaded file and follow the on-screen instructions.
3. Restart the notebook when the installation is complete.
Or
Download the driver to the computer which you are using to chat with me and transfer it to the Notebook using any USB device or copy the drivers to a CD or DVD and install them in the Notebook.

Make sure to restart the system after installing the UAA driver and then install Audio driver from the below URL.

Conexant High Definition Audio Driver :
ftp://ftp.hp.com/pub/softpaq/sp34001-34500/sp34200.exe
This will create a swsetup folder in c drive ("C:\swsetup\sp34200")
 
Installing Audio  drivers may result in an error. But continue with the following steps to get the audio driver installed correctly. Installation instructions of Audio driver:
 
1. Click on Start and select Run. Now type devmgmt.msc and press enter.
2. Right click on "Audio device on High Definition Audio Bus" and click update driver.
3. Select "Install from a list or specific location"
4. Click Next. Then select "Don't search, I will choose the driver to install"
5. Click Next and then select "Sound, video and game controller" from the list.
6. Click Next and then click Have Disk.
7. Click Browse C:\swsetup\sp34200 folder and select the .inf (wis30b2a) file and click open and Continue with the onscreen instructions.

Modem driver:
For downloading and installing the modem driver, you can access the followinglink and in the webpage displayed, click on Download button and follow the below steps.
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp...

1. Download and Save this file to Desktop.
2. After downloading this file, Double-click the file that you have downloaded. Follow the on screen instructions during installation.
3. After the installation is completed, you should reboot your system.

Intel PRO/Wireless Drivers (Intel PRO/Wireless 3945ABG)
ftp://ftp.hp.com/pub/softpaq/sp34001-34500/sp34136.exe

Realtek RTL8100CL/RTL8110Sb NIC Driver:
ftp://ftp.hp.com/pub/softpaq/sp30001-30500/sp30156.exe

Realtek RTL8139/810x Family Fast Ethernet NIC Driver:
ftp://ftp.hp.com/pub/softpaq/sp30001-30500/sp30156.exe
Or
ftp://ftp.hp.com/pub/softpaq/sp32001-32500/sp32105.exe

Broadcom drivers:
ftp://ftp.hp.com/pub/softpaq/sp34001-34500/sp34152.exe

Synaptic Touchpad Drivers:
ftp://ftp.hp.com/pub/softpaq/sp35001-35500/sp35444.exe

5 in 1 Media card reader driver:
ftp://ftp.hp.com/pub/softpaq/sp33501-34000/sp33604.exe

HP Quick Launch Button:
ftp://ftp.hp.com/pub/softpaq/sp35501-36000/sp35977.exe

Realtek RTL8100CL LAN Driver:
ftp://ftp.hp.com/pub/softpaq/sp30501-31000/sp30580.exe

Chipset Driver:
http://asia.giga-byte.com/FileList/Driver/motherboard_driver_chipset_int...

    
Video Driver:
ftp://ftp.hp.com/pub/softpaq/sp35501-36000/sp35810.exe
OR
http://asia.giga-byte.com/FileList/Driver/motherboard_driver_vga_intel_9...
OR
Softpaq Number: sp36294.exe
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp...

Intel SATA AHCI Controller Driver:
ftp://ftp.hp.com/pub/softpaq/sp36001-36500/sp36132.exe

Installation Instructions
1. Download the SoftPaq .EXE file to a directory on your hard drive.
2. Execute the downloaded file and follow the on-screen instructions. A diskette containing the driver is created, and the driver files are also made available at c:\swsetup\sp36132. If you choose to cancel diskette creation, you will need to copy the driver files to the chosen media.

To use the diskette during a new operating system installation, complete the following steps (choose the procedure that matches the operating system you are running).

For Microsoft Windows XP:
NOTE: A USB diskette (floppy) drive is required to use this driver. If an external USB diskette drive is used, ensure that it is plugged into the system before starting Step 1.

1. Insert the operating system CD, and Power On the notebook to boot from the CD.
2. At the very beginning of the operating system installation, the following prompt is displayed at the bottom of the screen: "Press F6 if you need to install a SCSI or RAID driver...."When the prompt is displayed, press F6.
3. Later in the operating system installation, you are notified that a mass storage device could not be detected. When this notification occurs, press S (S=Specify Additional Device).
4. When prompted, insert the diskette that was created from the SoftPaq file, and then press Enter.
5. Select "Intel 82801HEM/HBM SATA AHCI Controller (Mobile ICH8M-E/M)" and press Enter.
NOTE: At this point, the following prompt MAY be displayed, depending on the version of your operating system CD. If the prompt is displayed, press Enter to use the default Windows driver and continue, if it is not displayed, continue with next step 6. The prompt reads as follows: Windows already has a driver that you can use for "Intel 82801HEM/HBM SATA AHCI Controller (Mobile ICH8M-E/M)". Unless the device manufacturer prefers that you use the driver on the floppy disk, you should use the driver in Windows. S=use the driver on floppy ENTER=use the default Windows driver
6. Continue with the operating system installation, as prompted.
NOTE: If a problem is encountered when using the external USB floppy drive,
refer to Microsoft Knowledge Base Article 916196: "A connected USB floppy
disk drive does not work when you press F6 to install mass storage drivers
during the Windows XP installation process."

Installation Instructions :
1. Download the spXXXXX.EXE file to a directory on your hard drive.
2. Execute the downloaded file and follow the on-screen instructions.
3. Restart the notebook when the installation is complete.

Download these files and save them for back up for future use. Incase you have any queries, feel free to contact us with your queries and suggestions.

Our Address:

Zyxware Technologies
3/118, Kesavadasapuram,
Pattom P.O,
Trivandrum - 695004

Phone: 0471-4063818
Mobile: )-9446-06-9446

Email: info@zyxware.com
Website: www.zyxware.com